Switchable Graphics - Intel HD4000 and AMD Radeon 7850M

Posted 31 August 2014 - 04:36 PM

mnfesq

Emenef, Esquire

Members

1,091 posts

Gender:Male

Location:Southern California

I have never been able to use my dedicated AMD Radeon 7850M GPU to work on my HP Envy 17 laptop. There is no way to select it in the BIOS. In Windows, switchable graphics works via an AMD app that lets you select which GPU to use per application. It is my understanding that OS X also allows for switchable graphics based on power management.

I have been tinkering with my DSDT to get both GPUs recognized. I'm pretty close but still can't get the Radeon GPU to function. Here are some pics that show my status. Any ideas where to go from here?

Posted 02 September 2014 - 04:58 AM

HBP112358

InsanelyMac Sage

Members

280 posts

Location:USA

we(the community) would need a dump from a working dual card MAC, and then trace what in the kexts allow that functionality. due to the limited number of people attempting to use that feature it has not been pursued.

Follow RampageDevs guide: http://rampagedev.wo...er-personality/ to create a modified framebuffer. Note that he uses a different method to obtain the VBIOS and you don't need to modify the kext, we use Clover to inject instead.

Follow RampageDevs guide: http://rampagedev.wo...er-personality/ to create a modified framebuffer. Note that he uses a different method to obtain the VBIOS and you don't need to modify the kext, we use Clover to inject instead.